Effect of different Mo contents on microstructure and short-time high-temperature mechanical properties of Al-Mg alloy rolled plates
Based on the demand for the development of high-strength refractory Al-Mg alloys,Al-Mg alloys with different Mo contents of 0％,0.08％,0.17％,0.37％,0.53％and 0.86％by mass were designed and prepared,and H3xx rolled plates were obtained by deformation heat treatment.The microstructure and short-time high-temperature mechanical properties of the rolled plates were examined and analyzed by combining optical microscopy,X-ray diffractometer,tensile testing machine,Zeiss Gemini 300 with energy spectrometer(EDS)and other characterization equipment to reveal the strengthening and toughening mechanism of Al-Mg alloys in relation to trace Mo.The results show that the Mo alloyed H3xx Al-Mg alloy exhibits higher mechanical properties mainly attributed to the diffusion strengthening effect and recrystallization inhibition effect of Al12 Mo dispersion phase presenting a semi-coherent relationship with aluminum matrix.However,excessive Mo tends to form refractory Al12Mo crystal phase with higher Mg solid solubility inconducive to the improvement of the alloy properties.Al12Mo dispersive phase shows certain stability at high temperature,with the recrystallization grain growth significantly hindered at high temperature,thus improving the high temperature performance of Al-Mg alloy.When Mo content is 0.08％,the high temperature performance is the best,and the high temperature strength increases by 22.5％.Compared with Al-Mg alloy without Mo addition,the mechanical properties at room temperature and short-term high temperature are improved.
Al-Mg alloyMo alloyingmicrostructuresecond phasehigh temperature strength
万方数据
维普
